Create directories and upload files to Sharepoint from PowerShell

Create a new folder on Sharepoint server hosted at http://server/:
$url = "http://server/Shared%20Documents/newfolder/"
$req = [System.Net.HttpWebRequest]::Create($url)
$req.Credentials = [System.Net.CredentialCache]::DefaultCredentials
$req.Method = "MKCOL"
$res = $req.GetResponse()


Add a file to that folder:
$dest = $url+"newfile.txt"
$src = "C:\myfile.txt"
$wc = New-Object System.Net.WebClient
$wc.Credentials = [System.Net.CredentialCache]::DefaultCredentials
$wc.uploadfile("$dest", "PUT", $src)